Investigation of temperature-swing adsorption of aromatic compounds in water using polyampholyte gels with hydrophilic nonionic groups

Authors

  • Shintaro Morisada,

    Corresponding author
    1. Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-Ku, Yokohama, Kanagawa, Japan
    • Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-Ku, Yokohama, Kanagawa, Japan
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  • Hiroko Suzuki,

    1. Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-Ku, Yokohama, Kanagawa, Japan
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  • Yoshitsugu Hirokawa,

    1. Department of Materials Science, The University of Shiga Prefecture, Hassaka, Hikone, Shiga, Japan
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  • Yoshio Nakano

    1. Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-Ku, Yokohama, Kanagawa, Japan
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Abstract

The adsorption and desorption behaviors of bisphenol-A in water have been studied using the temperature-responsive polyampholyte gels composed of sodium styrene sulfate (SSS), vinylbenzyl trimethylammonium chloride (VBTA), and N,N′-dimethylacrylamide (DMAA). The resultant behaviors of the SSS-VBTA-DMAA gels of three different monomer compositions are compared with those of the SSS-VBTA gel that can adsorb bisphenol-A at room temperature and desorb the pre-adsorbed bisphenol-A at higher temperature as in our previous report (Morisada et al., Adsorption 2008, 14, 621), to elucidate the effect of DMAA on the adsorption property of the polyampholyte gel. The adsorption isotherms, which were described by Henry's law, indicated that the adsorption amounts of bisphenol-A onto the SSS-VBTA-DMAA gels at 298 K are much larger than those at 353 K. At 298 K, the Henry's adsorption constant for the SSS-VBTA-DMAA gel with the lowest mole fraction of DMAA was larger than that for the SSS-VBTA gel, whereas a further increase in the DMAA mole fraction resulted in a decrease in the adsorption constant. Moreover, the temperature-swing adsorption experiments demonstrated that the SSS-VBTA-DMAA gel can repeatedly adsorb bisphenol-A at 298 K and desorb some of the pre-adsorbed bisphenol-A at 353 K, where the desorption amount of bisphenol-A is larger than that from the SSS-VBTA gel. The results obtained here show that the addition of DMAA to the SSS-VBTA gel slightly improves the performance of the gel as a temperature-responsive adsorbent. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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